When you open the bolt on one of those conversions - often there is a cam that brings back the firing pin from the "fired" position - so the bolt body is holding the firing pin back, on a conversion - "cocked on close" types do not much with the firing pin. As you slide the bolt forward, that "firing pin hold" is transferred to the trigger sear - the bolt body moves forward slightly so that it is the trigger sear, not the bolt body, that is holding the firing pin back - that might be occurring as the bolt handle is dropped downwards - hence, the very last part of the "cocking" action - the last few percent of main spring compression - occurs when it becomes the trigger sear holding back the firing pin, is done on the forward motion of the bolt body. There are several P14, M1917 and Mauser 98 actions here - most do not have barrels on them - they mostly all work the same for the final step of "cocking" the firing pin. As do M93 Mausers, M96 Swede, etc.